Type-writing machine.



UNITED STATES PATENT OFFICE.

FRANK A. YOUNG, F NFMl YORK, N. Y., ASSIGNOB T0 UNDEBWOOD 'IYPEWBITEB COMPANY, 0F NEW YORK, N. Y., A CORPORATION 0F NEW JERSEY. i

TYPE-WRITING MACHINE.

Specification of Letters Patent. Patented DIay 31, 1910, Application filed Iarch 24, 1910. Serial No. 551,388.

To all whom it may concern: l The Underwood typewriting machine 4is Be it known that I, FRANK A. YOUNG, a citlzen of the United States, residing in 'New York, in the count-y of New York and State of New York, have invented certain new and useful Improvements in Type-Writing Machines, of which the following is a specification.

This invention relates to the ribbon-wind-- ing mechanisms of typewriting machines.

n the Underwood and other writing machines, the ribbon is wound by, means of power applied at the finger keys. Said keys usually operate a universal bar whereby is controlled the mechanism which permits the step-by-step esoapement of the paper-car-- riage. Usually connected to this escapement mechanism, are -reciprocating pawls which drive the ribbon-winding ratchet-s. The space-key, which feeds the paper-carriage to reduce a blank or space between words, aso usually operates the ribbonwinding mechanism, so that the ribbon is fed idly between words, or when paragraphing, or otherwise spacing the paper by means of the space-key. This causes the ribbon to be used irregularly, and in some cases is a further objection where the ribbon is vibrated to cover and uncover the printing point at every key stroke, it being esirable in such machines to cause the ribbon to feed as slowly as possible through the vibrator.

According to the present invention, the space-key operates a tri which throws `out the ribbon-winding pawl), so that the latter,l altl'iough reciprocatcd in the usual manner, does not turnl the ratchet nor wind the ribbon; the latter being, therefore, fed only by lthe type-operating keys.

The accompanying drawings show the ribbon-winding and controlling parts at one sideof the machine; but it will be understood that they are duplicated on the opposite side thereof.

Figure 1 is a detail perspective view of ratchet. 100 the principal parts of the invention. Fig. 2 By depressing the usual space-key or bar is a side elevation of an Underwood type- 39, the escapement is operated to space bewriting machine with the invention applied tween words. The space-bar is' carried'on thereto, the parts being shown in normal pospacing levers 40 fast on a springreturned sitions. Fig. 3 is an enlarged detail View, rock shaft 41 journaled in the frame A, said 105 showing the positions of the ribbon-feeding rock shaft having an arm 42 to engage and pawl andcoperating parts when the spaceswing the crank arm 32 ofthe escapement. bar is depressed. Fig. 4 is a similar View, A finger 43, mounted on the space bar showin@r the positions of the parts when a rock shaft 41, is interposed in the path of key is depressed. the ribbon-feeding pawl, or ofV a releasing 110' provided with key levers 1, fulcrumed at 2l on a bracket 3, to operate a type-bnr 9,

through the medium of a lever 4, 4, fulnected at 8 with the inner end of the type-v bar 9, fulcrumed at 10 in a segment 11, and carryinfr a type 12.

A rib on (not shown) interposed between the types and the platen, is coiled on spools 13 mounted on vertical shafts 14, connected by gears 15, 16 to a shaft 17, turned step by step by a pawl 18, engaging a ratchet wheel 19 fast on said shaft 1 The type-bals 9 are equipped with heels 20, which, as the types approach the platen operate a universal bar 21, forming part o the carriage feedmechanism, and carried b a frame 22 pivotally attached at 23, to roc arms 24, the latter hinged to the escapement bracket 25, at, 26. The usual ribbon-vibrating mechanism includes a slotted actuator Y 26a on the riniversal bar. The carriage escapement also includes a pair of dogs 27, 28, alternately engaging an escapement wheel 2S), connected to a pinion 30 in mesh with a rack 31, on a carriage (not shown). The operation of the universal'bar not onlyr effects the feed of the carriage, but also turns the rock arms 24 to'operate a crank arm 32, connected at 33 with the operating arm 34 of av rock shaft 35, to which is secured an arm 36, pivotally supporting the ribbonfeedingpawl I8, which is held by a spring 37 in engagement with the ratchet 19, to turn the latter and the ribbon shaft 17 step by step. The depression of the key 1, draws the ribbonfeeding pawl idly over the ratchet to take a new bite thereon, and the return of the key to normal position causes pawl or detent 38 also usually engages the nose or cam 44 carried thereby, to eiect the disengagement of the paWl from the ratchet, each time the space-bar is operated. hormally, the finger lies apart from the releasing nose or cam (as in Figs. 2 and 4) to allow the ribbon-feeding pawl to. operate as Having thus described my invention, I

claim:

1. In a typewriting machine, the combination with a key-operated escapement and a ribbon-feeding mechanism operated thereby, including a pawl and ratchet dm'ice, of a space bar operatively connected with the escapement, and release mechanism operated by the-space bar to disconnect the pawl and ratchet.

2. In a typewriting machine, the combination with a key-operated escapement and a 'bbonieeding mechanism operated thereby, including a pawl and ratchet device, of a space bar operatively connected with theescapement, and a fulcrum moved by the operation ef the space bar into the path of the t paWl to effect the disengagement of the latter from the ratchet.

3. In a typewriting machine, the combination With a key-operated escapement and a including a pawl and ratchet device, of a space bar operatively connected with the escapement, a cam or nose on the pawl, and a finger movable into the path of said cam or the disengagement of the pawl and ratchet.

4. In a typewriting machine, the combination with an escapement and a ribbon-feed-Y ing mechanism operated thereby, including,r

eratively connected with the cscapelnent mechanism, and a ribbon-feed rch-ase operated by the space bar to intercept the pa'wl on its idle stroke and etl'ect its release from the ratchet.

5. In a typcwritinfc;` machine, an escapement mechanism capable orn operating a pawl, whereby lto actnate a ribbon-feeding ratchet, and a. space bar to operate the escapei'nent throuUh which the ribbon-feeding pawl is actuatet, of a ribbon-feed release interposed in the path of the pawl when operated from the space bar, whereby to utilize the movement in'lparted to the nani by the escapement, to diseiitc'agc said pani from the ratchet.

' FRANK A. YOUNU.

1Witnesses /L K. FRANKFURT, C. RIPLEY.

ribbon-feeding mechanism operated thereby, .l

nose when the space bar is operated to etl'ect a pawl and ratchet device, oi` a space har op .f 

